JP3664400B2 - ECG display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrocardiogram display device and a display method for displaying an electrocardiogram, and more particularly to an electrocardiogram display device and a display method suitable for a small electrocardiogram measuring device such as an electrocardiogram telemeter and a holter electrocardiograph.
[0002]
[Prior art]
Conventionally, an electrocardiogram has been widely used as a diagnostic index for heart disease, and has been measured continuously for a relatively long time, such as 24 hours, from a short time measurement in a health checkup to a subject exhibiting symptoms such as arrhythmia. Various measurement methods and measurement devices (electrocardiographs) suitable for each measurement method are used.
[0003]
Among electrocardiographs, holter electrocardiographs used for continuous measurement for 24 hours during daily life, and electrocardiogram telemeters used for remote and constant measurement of electrocardiograms of subjects in hospital rooms It is necessary to record and transmit an electrocardiogram for a long time while being worn on the subject. For this reason, electrocardiographs have been actively downsized in order to realize low power consumption and reduced burden on the subject. As a result, miniaturized, weighing electrocardiographs and electrocardiogram telemeters incorporating digital technologies such as semiconductor memory and digital signal processing have been realized.
[0004]
In this specification, an electrocardiograph refers to a device having an electrocardiogram measurement function, and may or may not have a function of recording the measured electrocardiogram in a memory or the like.
[0005]
FIG. 1 is a block diagram showing a circuit configuration example of a Holter electrocardiograph.
In FIG. 1, 1 is a CPU that executes a control program stored in a ROM 2 to control the entire Holter electrocardiograph, 2 is a ROM that stores programs executed by the CPU 1, parameters necessary for processing, and the like. RAM 4 for temporarily storing the progress of various processes, etc., 4 is a storage device for storing the electrocardiogram information collected from the subject in the form of digital data, and a removable recording medium such as a flash memory can also be used. .
[0006]
Reference numeral 5 denotes a timekeeping unit that is a real-time clock for posting time, and reference numeral 6 denotes a display unit that includes an LED that indicates on / off of a power source and a liquid crystal display LCD. Reference numeral 7 denotes a switch circuit for setting various operating conditions. The switch setting state of the switch circuit 7 is connected to the input port of the CPU 1, and the CPU 1 can recognize the setting state of the switch circuit 7 at any time by reading this input port.
[0007]
Further, 10 is an analog-digital conversion unit (A / D conversion unit) that converts analog detection information from a living body into corresponding digital information, and 11 is acceleration data detection that detects movement information (biological posture information, etc.) of the living body. An electrocardiogram detection unit having electrocardiogram electrodes that collects electrocardiogram information is composed of first to third channels.
[0008]
An acceleration data detector 11 and an electrocardiogram detector 12 can always be connected to the A / D converter 10. Further, reference numeral 20 denotes a serial communication control unit that can be provided as an option. The serial communication control unit 20 can directly perform data communication with other devices via a communication medium. For example, as shown in FIG. 1, it is possible to connect to a communication network 30 such as a LAN, a public switched telephone network or the Internet, and the collected electrocardiogram information is directly transferred to another communication device 40 via the communication network 30. It is also possible.
[0009]
As for an electrocardiogram telemeter, for example, as disclosed in Patent Document 1, a biological electrode worn by a subject, a waveform processing circuit that performs waveform processing on the acquired biological signal, and a signal waveform is converted into a radio frequency signal. A transmission circuit and an antenna. In addition, there are digital signals that are digitized during signal processing and transmitted as digital data.
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-269417
[Problems to be solved by the invention]
In such an electrocardiograph that is desired to be miniaturized, only a display device having a size capable of displaying the minimum necessary display can be used to reduce the power consumption while reducing the size of the main body. For this reason, a small monochrome display device is generally used instead of a large display device (color or monochrome) capable of detailed display like a large electrocardiograph.
[0012]
On the other hand, such an electrocardiograph is often worn or operated by the subject himself / herself, and information on the electrocardiograph, for example, whether the power is on or off, can be used for accurate and appropriate measurement. It is desirable to transmit information such as whether or not an electrocardiogram is being measured or whether or not it is operating normally so that the subject can clearly understand. However, since the size of the electrocardiograph is reduced, the display device is also reduced in size, making it difficult to clearly communicate various information to the subject.
[0013]
In addition, in an electrocardiogram telemeter, it is impossible to know information about whether or not an electrocardiogram is correctly measured unless it goes to a nurse center and looks at a receiving device and a display device installed there.
[0014]
For example, information that can be converted to binary, such as power on / off, device abnormal / normal, electrocardiogram being measured / standby, etc., is clarified by turning on / off the LED, as is done in general electrical equipment in general. Can be displayed. However, such a display method cannot cope with whether the electrocardiogram being measured is appropriate.
[0015]
The present invention has been made in view of such problems of the prior art, and its purpose is limited display capability and can be easily grasped on the spot by general users and medical staff. Thus, an object is to provide an electrocardiogram display device capable of displaying an electrocardiogram measurement state.
[0016]
[Means for solving the problems]
That is, the gist of the present invention is an electrocardiogram display device having detection means for detecting an electrocardiogram and display means having a plurality of display elements, and lights up among the plurality of display elements based on the detected level of the electrocardiogram. Display element determining means for determining a display element to be displayed, and display control means for controlling display of the display means based on the determination of the display element determining means, the display means depending on the individual shape or arrangement of display elements The present invention resides in an electrocardiogram display device which performs display imitating an electrocardiogram waveform.
Another gist of the present invention resides in an electrocardiograph using the electrocardiogram display device of the present invention.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings.
The electrocardiogram display device according to the embodiment of the present invention can be applied to, for example, the Holter electrocardiograph described in FIG. 1 or the electrocardiogram telemeter. In this case, the CPU 1 and the display unit 6 in FIG. 1 constitute an electrocardiogram display device.
[0018]
Fig.2 (a) is a figure which shows an example of the display element shape and arrangement | positioning of the display part 6 in this embodiment. FIG. 2A shows a state in which all the display elements are turned on so that the shape of the display elements becomes clear.
[0019]
The display unit 6 is composed of a display device having a display element such as an LCD or LED, and in the present embodiment, in order to realize a reduction in size, low power consumption, and ease of control of the display unit 6, A display device that is not in a matrix format is used. Then, the shape of the display element is determined so as to be similar to the characteristic portion (here, the QRS wave portion) of the general electrocardiogram waveform shown in FIG.
[0020]
Specifically, a plurality of trapezoidal second display elements 52 are arranged across a long and narrow first display element 51 that recalls a reference level. The second display element 52 has a shape that becomes thinner as the distance from the first display element 52 increases, and the height of the second display element 52 decreases with increasing distance from the first display element 51.
[0021]
As shown in FIG. 2B, the R wave has a steep shape in the electrocardiogram waveform, and the electrocardiogram is obtained by changing each shape of the second display element depending on the position from the first display element 51. The display having a high correlation with the waveform fluctuation can be realized with a small number of display elements.
[0022]
(Display at the time of ECG acquisition)
A display operation when collecting electrocardiogram information using the electrocardiograph described in FIG. 1 will be described. First, when the flash memory is not attached to the storage device 4, it is attached to the storage device 4. Then, the electrocardiogram electrode of the electrocardiogram detector 12 is attached to a predetermined chest part of the subject to be described later. Then, the device is activated to start collecting ECG information.
[0023]
The A / D conversion unit 10 amplifies the detected biological signal from the electrocardiogram detection unit 12 to a predetermined level, then samples the digital signal by sampling at a predetermined frequency and the number of bits, and the CPU 1 converts the digital signal to the time measuring unit 5. Are sequentially written in a predetermined area of the flash memory together with the clock time information. The CPU 1 determines a display element to be turned on (turned on) on the display unit 6 from the signal level of the digital electrocardiogram signal, and causes the display unit 6 to display the display element.
[0024]
The relationship between the level and the display element to be lit can be arbitrarily set. However, in order to visually recall the similarity between the electrocardiogram waveform and the display, it is assumed that the electrocardiogram data is acquired normally by making the first display element 51 correspond to the reference level of the electrocardiogram waveform. The peak level is preferably set so that the second display element furthest upward from the first display element 51 is lit.
[0025]
The display unit 6 changes the display content as shown in FIG. 3, for example, depending on the level change of the acquired electrocardiogram waveform, and thus the subject can easily determine whether or not the electrocardiogram can be normally acquired. . For example, if a display element whose time interval corresponds regularly according to the vibration beat should be displayed, it is not displayed, that is, the acquired ECG waveform has a small amplitude or the time interval is not regular It can be seen that the electrode mounting is inappropriate.
[0026]
Note that FIG. 3 shows a case where display control is performed so that the number of elements that are simultaneously turned on increases as the absolute value of the level increases. However, only one element corresponding to the level is turned on, The display element 51 can be lit at all times as the baseline of the electrocardiogram waveform, and the second display element can be controlled in various forms such as only one element corresponding to the level.
[0027]
In this way, the detection and recording operation of the electrocardiogram signal is continued as long as the storage capacity of the flash memory permits. If the storage capacity of the flash memory is exhausted, even if it operates to stop the measurement here, or overwriting from where it was first written again, the latest ECG signal for a predetermined time is always recorded. You may control so that it may be in the state currently performed.
[0028]
In addition to the waveform display device shown in FIG. 2A, the display unit 6 represents device states that can be expressed in binary, such as operation / non-operation, battery capacity OK / NG, and the like. LED etc. may be provided.
[0029]
As described above, according to the present embodiment, an electrocardiogram waveform can be easily displayed to the user by using a small number of display elements, and particularly, as in a Holter electrocardiograph or an electrocardiogram telemeter, downsizing and low power consumption can be achieved. An electrocardiogram display device suitable for the desired device can be realized.
[0030]
[Other Embodiments]
In the above-described embodiment, the case where the electrocardiogram display device of the present invention is incorporated into an electrocardiograph has been described. However, the electrocardiogram display device according to the present invention can be used alone other than such an embedded application. is there.
[0031]
In this case, the electrocardiogram display device 100 according to the present invention includes a control unit 101 and a display unit 102 as shown in FIG. The control unit 101 includes, for example, an interface for connecting to the storage device 103 or an external device, a CPU, a RAM, a ROM, a display control circuit for performing display control of the display unit 102, and the like, and stores a program stored in the ROM. By executing this, display control of the electrocardiogram is performed. The display unit 102 is a display device equivalent to the display unit 6 in FIG.
[0032]
In this embodiment, the electrocardiogram data is stored in advance in the storage device 103, for example, and the electrocardiogram data is read from the storage device 103 and displayed. That is, the control unit 101 sequentially reads the electrocardiogram data from the storage device 103, compares the level with a predetermined threshold value, determines a display element to be displayed on the display unit 102, and displays based on the result. Display is performed by controlling the unit 102.
[0033]
The electrocardiogram data may be prepared in advance, or may be input in real time as described in the above embodiment. In the case of input in real time, the control unit 101 may perform A / D conversion, or a separate A / D converter may be provided.
[0034]
Also in the electrocardiogram display device having such a configuration, the same effect as that of the above-described embodiment can be obtained.
[0035]
The shape of the display element in the display unit 6 is not limited to the above-described shape as long as the change in the electrocardiogram waveform can be recalled visually. For example, if the waveform shape does not change greatly, such as when the electrocardiogram guidance format to be displayed is fixed, as shown in FIG. 5, the characteristic portion of the model waveform (the R wave and its vicinity in FIG. 5) is displayed. The LEDs printed on the base of the display unit and arranged at predetermined positions of the model waveform (peaks, slopes, and other feature points in FIG. 5) are sequentially turned on according to the level of the detected electrocardiogram waveform. Also good.
[0036]
In the example of FIG. 5, the level of the electrocardiogram waveform may be buffered for an appropriate time, and an absolute level and a level for determining which LED should be lit based on the level change before and after may be determined.
[0037]
Even with such a configuration, an electrocardiogram waveform can be displayed in an easy-to-understand manner for the user with a few display elements.
[0038]
【The invention's effect】
As described above, according to the present invention, it is possible to realize an effect that an electrocardiogram waveform can be displayed in an easy-to-understand manner for a user with a few display elements.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a Holter electrocardiograph to which the present invention can be applied.
2A is a diagram showing an example of the display element shape and arrangement of a display unit of an electrocardiogram display device according to an embodiment of the present invention, and FIG. 2B is a diagram showing an example of an electrocardiogram waveform;
FIG. 3 is a diagram showing a display example in the electrocardiogram display device according to the embodiment of the present invention.
FIG. 4 is a diagram showing a configuration example of an electrocardiogram display device according to another embodiment of the present invention.
FIG. 5 is a diagram showing a form example of a display unit of an electrocardiogram display device according to another embodiment of the present invention.

Claims (4)

An electrocardiogram display device comprising detection means for detecting an electrocardiogram and display means having a plurality of display elements,
Display element determining means for determining a display element to be lit among the plurality of display elements based on the detected level of the electrocardiogram;
Display control means for controlling display of the display means based on the determination of the display element determination means,
An electrocardiogram display device, wherein the display means performs display imitating an electrocardiogram waveform by each shape or arrangement of the display elements. The display means includes a first display element representing a reference level and a plurality of second display elements arranged with the first display element interposed therebetween, and the shape of the second display element is: 2. The electrocardiogram display device according to claim 1, wherein the electrocardiogram display device has a trapezoidal shape that becomes narrower as the distance from the first display element increases. The display means has a plurality of display elements, and the plurality of display elements are arranged at positions representing a plurality of predetermined feature points in a waveform diagram simulating a predetermined section in one cycle of a general electrocardiogram waveform. The electrocardiogram display device according to claim 1, wherein: An electrocardiograph using the electrocardiogram display device according to any one of claims 1 to 3.

Images